Go to a nested ViewController from a main TabBarController programmatically in Swift - ios

Question

I have the following ViewController structure, see image below.
Whenever I want to move from ViewController 1 to any of the other main controllers I use self.tabBarController?.selectedIndex = indexNumber
// for instance, this would take me to ViewController 3
self.tabBarController?.selectedIndex = 2
Based on the picture below, how can I go from ViewController 1 to TargetViewController programmatically when a button is tapped in ViewController 1?
FYI -
In the picture below I'm showing a button in ViewController 3 this is just to show the storyboard structure, the actual button-tap will happen in ViewController 1
EDIT:
Here is how you do it based on Prashant Tukadiya's answer.
ViewController 1
In ViewController 1 add the following in your tap event.
self.tabBarController?.selectedIndex = 2
let nav = (self.tabBarController?.viewControllers?[2] as? UINavigationController)
let vc = TargetViewController.viewController()
nav?.pushViewController(vc, animated: true)
TargetViewController
In your TargetViewController add the following class method.
class func viewController() -> TargetViewController {
let storyboard = UIStoryboard(name: "Main", bundle: nil)
return storyboard.instantiateViewController(withIdentifier: "targetViewControllerID") as! TargetViewController
}
Add targetViewControllerID in the Storyboard ID field.

Answer 1

I was facing same before a couple of days and finally, I got a solution maybe this will help you.
TabController.shared.tabcontroller.selectedIndex = 1
let navigation = TabController.shared.tabcontroller.selectedViewController?.navigationController
let SavedAddress = self.storyboard?.instantiateViewController(withIdentifier: "SavedAddressVC") as! SavedAddressVC
navigation?.pushViewController(SavedAddress, animated: true)
I have used the same solution. and this is the working code for me.

Answer 2

You can directly give identifier to the TargetViewController from storyboard and load from storyboard then and push or present it.
like add this method in your TargetViewController
class func viewController () -> TargetViewController {
let storyboard = UIStoryboard(name: "Main", bundle: nil)
return storyboard.instantiateViewController(withIdentifier: "yourIdentifer") as! TargetViewController
}
and on tap event
let vc = TargetViewController.viewController()
self.navigationController?.pushViewController(vc, animated: true)
EDIT
After reading comments got clear idea about your requirements
On button action from ViewController1, You want to goto TargetViewController but when press back you want back to viewController 3
Select particular index first
self.tabBarController?.selectedIndex = 2
After that you need to grab UINavigationController
let nav = (self.tabBarController?.viewControllers?[2] as? UINavigationController)
then Push ViewController
let vc = TargetViewController.viewController()
nav?.pushViewController(vc, animated: true)
Note: Don't forgot add identifier to storyboard to TargetViewController and also add class func viewController () -> TargetViewController method to TargetViewController
Hope it is helpful

Answer 3

In action function of a button in ViewController 1 , you can use this :
func presentMethod(storyBoardName: String, storyBoardID: String) {
let storyBoard: UIStoryboard = UIStoryboard(name: storyBoardName, bundle: nil)
let newViewController = storyBoard.instantiateViewController(withIdentifier: storyBoardID)
self.definesPresentationContext = true
self.present(newViewController, animated: true, completion: nil)
}
//usage
presentMethod(storyBoardName: "Main", storyBoardID: "TargetViewController")